class MyRunnable implements Runnable {
    @Override
    public void run() {

        while (true){System.out.println("hello thread");
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }     
        }
    }
}
public class Demo2 {
public static void main(String[] args) {
    Runnable runnable = new MyRunnable();
    //runnable.start(); Runnable接口不能直接调用start方法，需要通过Thread类来调用
    Thread thread = new Thread(runnable);
    thread.start();
    while(true){System.out.println("hello main");
        try {
            
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}
}
